The term DIAMOND BASE is a combination of two words, 'DIAMOND' and 'BASE'. Diamonds are precious stones that are highly valued for their beauty and rarity. They are often used in jewelry and other decorative items. BASE refers to the foundation or bottom layer of something. In this case, DIAMOND BASE is likely referring to a BASE layer of diamonds, which could be used as a decorative element or to provide strength and durability to an item. The crossword solution for DIAMOND BASE is BAG, which could refer to a BAG made with a DIAMOND BASE layer for added strength and durability.